I have seen a few guys asking about spotting scopes, thought I would show my appreciation for my Kowa TSN-664 20-60x66. Before I bought this scope I owned a Vortex Viper 20-60x80 (before it was stolen from my truck). IMHO, optically, the Kowa is so far past the Viper there is no comparison, the detail and clarity with this scope is very impressive for a 1600$ (about) scope. It is also very light weight, with 20-60 eye piece it is aprox 2.75 lbs,, pretty good for a 20-60 power! The durability is superb as well, first hunt with this scope while bowhunting I dropped it off my backpack (about 5.5") right onto a rock... it cracked the sunshade that is all. Through dozens of backpack hunts, and summer scouting hanging off my truck window down gravel roads for hours, many scuffs and scrapes are all to show. Warranty is 10 year... no vortex warranty but in my opinion its worth it if you are looking for a reasonably priced, optically superior scope that won't wear you down on a hunt.
http://www.kowaproducts.com/KowaTSN-660SeriesSpottingScopes/KowaTSN-664MStraightSpottingScope/
http://www.kowaproducts.com/KowaTSN-660SeriesSpottingScopes/KowaTSN-664MStraightSpottingScope/